At the risk of having the thread peeled off by the mod and moved to general natter on safety/ risk assesments or otherwise, I suspect very few. Air crashes tend to be fatal, unless they are the kind where the aircraft hasn't taken off yet. To land a passanger aircraft on water is damn nigh impossible when its all working well, with a serious malfunction more so.
Having been involved in the design electronics for flight trials once, I can safely say I have never worked with a more risk averse bunch than flight safety officers. The idea of acceptable risk, i.e. that risk below which its more fruitful to put the effort into something else, had not really occurred to them. As a result you have to have a check that the safety catch is in place, and a further check that it has been checked correctly. The result is that the test electronics to be plugged into the plane which must not disintegrate into dangerous fragments until a G rating (10 I think) by which all humans are already dead is as a result it is about 10 times heavier than it need be.
However, because they cant see it, I can take a laptop and all sorts of heavy stuff and strap it into the seat beside me, as that is luggage. DOH!
This contrasts sharply with the nuclear chaps, who are happy to say that a leakage rate equal to pre-existing background radiation is OK, as it only doubles the risk, and means that you can't prove your cancer was caused by the their device or by natural radiation, as on the border the odds are exactly equal... so they are OK.
Some people are not objective about risk, and go into 'never again' mode after one accident so flukey that it will not happen again for ages. This makes us all jump hoops, and yet other, really quite risky things are done everyday. I remember hearing (somewhere) the anecdote that the H and S guy is the man who stops the machinist from using a drill bit, if the interlock on the guard on the drilling machine needs cleaning, but then stands on the platform to catch the train home and thinks nothing of it as the non-stop train before the one he wants passes through with nothing in the way to stop him falling in front of it..
I'm sure if cars were invented now, the idea of enough storing hydorcarbon fuel to fire the driver into space if burnt properly, in a single thin sheet metal tank, inches above the road, and passing through rubber pipes within inches of hot pipes and rotating parts, would be so horrific you'd never do it. But millions do, everyday, and most accidents are caused by something else.
Home cooking, causes food poisening up and down the land, but is not regulated anything at all like restaurants.
And then of course there is home wiring. But I dont want to go there right now.. you know my views.